All Implemented Interfaces:

Closeable, AutoCloseable, Readable
```
public class CharArrayReader
extends Reader
```
This class implements a character buffer that can be used as a character-input stream.

Since:

JDK1.1

Field Summary

Fields
Modifier and Type	Field and Description
`protected char[]`	`buf` The character buffer.
`protected int`	`count` The index of the end of this buffer.
`protected int`	`markedPos` The position of mark in buffer.
`protected int`	`pos` The current buffer position.

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Fields inherited from class java.io.Reader lock

Constructor Summary

Constructors
Constructor and Description
`CharArrayReader(char[] buf)` Creates a CharArrayReader from the specified array of chars.
`CharArrayReader(char[] buf, int offset, int length)` Creates a CharArrayReader from the specified array of chars.

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Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()` Closes the stream and releases any system resources associated with it.
`void`	`mark(int readAheadLimit)` Marks the present position in the stream.
`boolean`	`markSupported()` Tells whether this stream supports the mark() operation, which it does.
`int`	`read()` Reads a single character.
`int`	`read(char[] b, int off, int len)` Reads characters into a portion of an array.
`boolean`	`ready()` Tells whether this stream is ready to be read.
`void`	`reset()` Resets the stream to the most recent mark, or to the beginning if it has never been marked.
`long`	`skip(long n)` Skips characters.

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Methods inherited from class java.io.Reader read, read

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - buf
    protected char[] buf
    
    The character buffer.
  - pos
    protected int pos
    
    The current buffer position.
  - markedPos
    protected int markedPos
    
    The position of mark in buffer.
  - count
    protected int count
    
    The index of the end of this buffer. There is not valid data at or beyond this index.
- Constructor Detail
  - CharArrayReader
    public CharArrayReader(char[] buf)
    
    Creates a CharArrayReader from the specified array of chars.
    
    Parameters:
    buf - Input buffer (not copied)
  - CharArrayReader
    public CharArrayReader(char[] buf, int offset, int length)
    
    Creates a CharArrayReader from the specified array of chars.
    The resulting reader will start reading at the given offset. The total number of char values that can be read from this reader will be either length or buf.length-offset, whichever is smaller.
    
    Parameters:
    buf - Input buffer (not copied)
    offset - Offset of the first char to read
    length - Number of chars to read
    
    Throws:
    
    IllegalArgumentException - If offset is negative or greater than buf.length, or if length is negative, or if the sum of these two values is negative.
- Method Detail
  - read
    public int read() throws IOException
    
    Reads a single character.
    
    Overrides:
    
    read in class Reader
    
    Returns:
    The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached
    
    Throws:
    
    IOException - If an I/O error occurs
  - read
    public int read(char[] b, int off, int len) throws IOException
    
    Reads characters into a portion of an array.
    
    Specified by:
    
    read in class Reader
    
    Parameters:
    b - Destination buffer
    off - Offset at which to start storing characters
    len - Maximum number of characters to read
    
    Returns:
    The actual number of characters read, or -1 if the end of the stream has been reached
    
    Throws:
    
    IOException - If an I/O error occurs
  - skip
    public long skip(long n) throws IOException
    
    Skips characters. Returns the number of characters that were skipped.
    The n parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.
    
    Overrides:
    
    skip in class Reader
    
    Parameters:
    n - The number of characters to skip
    
    Returns:
    The number of characters actually skipped
    
    Throws:
    
    IOException - If the stream is closed, or an I/O error occurs
  - ready
    public boolean ready() throws IOException
    
    Tells whether this stream is ready to be read. Character-array readers are always ready to be read.
    
    Overrides:
    
    ready in class Reader
    
    Returns:
    True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
    
    Throws:
    
    IOException - If an I/O error occurs
  - markSupported
    public boolean markSupported()
    
    Tells whether this stream supports the mark() operation, which it does.
    
    Overrides:
    
    markSupported in class Reader
    
    Returns:
    true if and only if this stream supports the mark operation.
  - mark
    public void mark(int readAheadLimit) throws IOException
    
    Marks the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.
    
    Overrides:
    
    mark in class Reader
    
    Parameters:
    readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.
    
    Throws:
    
    IOException - If an I/O error occurs
  - reset
    public void reset() throws IOException
    
    Resets the stream to the most recent mark, or to the beginning if it has never been marked.
    
    Overrides:
    
    reset in class Reader
    
    Throws:
    
    IOException - If an I/O error occurs
  - close
    public void close()
    
    Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in class Reader

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/chararrayreader.html

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Class CharArrayReader

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